Many a young scientist ______ engaged in the research work.

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问题 Many a young scientist ______ engaged in the research work.

选项 A、have
B、has
C、have been
D、has been

答案D

解析 many a+名词单数是复数意义,单数形式,谓语应用单数形式。另外,be engaged in是固定搭配,表示“忙于,从事于”。
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